Spark plug with copper cored ground electrode and a process of w

Details Spark plug with copper cored ground electrode and a process of w Spark plug with copper cored ground electrode and a process of w

1994-10-24

1996-06-25

Yusko, Donald J.

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313326, 313311, 313 115, 219 7801, 445 7, H01T 1320

Patent

active

055303137

ABSTRACT:
The present invention includes a spark plug with a copper cored ground electrode wherein the copper core has a cross-sectional area of about 1.6 mm.sup.2 to about 3.0 mm.sup.2 and the remainder of the electrode is made from a nickel alloy sheath. The open end copper cored ground electrode is resistance welded to the steel shell using a light welding force of about 100 lbs. coupled with a low welding energy to eliminate voids and embrittlement in the copper core adjacent to the weld interface.

REFERENCES:
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patent: 4970426 (1990-11-01), Bronchart
patent: 5017826 (1991-05-01), Oshima et al.
patent: 5179313 (1993-01-01), Eves et al.
patent: 5210457 (1993-05-01), Oshima et al.
patent: 5395273 (1995-03-01), Matsutani

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